i dont really get what you are saying...so its happening in neutral? the only think i could think of is if you are in gear, especially in first gear, and you are slowing down and then disengage the clutch, that might happen just from the sudden release of torque on the transmission. other than that, i dont know what to tell you. doesnt sound major, but id make your dealer look at it, its a warranty for a reason. although then you wont have your bike for a few weeks while they get to it.